Sony UP-895, Service Manual

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4-14
UP-895/(E)
4-5. Thermal Head Section
4-5-1. Structure
The thermal head consists of one-line 1280 dots (64 bits
x
20). It includes the 20 pairs below.
(The DATA input is ten DATA [20:1], and other terminals are common.)
Internal Circuit Configuration of Thermal Head (One-port)
Timing Chart
VH
R1 R2 R3 R64
D1 D2 D3 D64
D64
D3
D2 D1
5V
DR
BEO
STB
DATA[n]
CLK
Output-stage
transistor
Latch section
Shift register
section
Print data (64 data)
64CLK
Head heat time
DR
BEO
DATA
CLK
STB
Goes “H” during print start.